浅析昭通褐煤盆地煤层气资源勘探前景

A Simple Analysis on Exploration Prospect of CBM Resources of the Lignite Basin in Zhaotong

昭通盆地地质条件简单褐煤资源丰富，在煤田地质勘探过程中，很多钻孔在钻遇煤层后出现气显示，预示昭通盆地新近系蕴藏有较丰富的煤层气资源。罐装煤样解吸揭示，物性是决定气体解吸的关键要素，这也是低煤阶煤储层含气量低但仍具有很大开发潜力的根本原因。本文从煤层气成藏条件入手，通过对气源、煤储层储集能力、盖层条件、构造条件、水动力条件的分析，同时结合煤储层含气性及生物气生成潜力分析，对昭通盆地新近系煤层气资源的勘探前景进行了初步评价。

Abstract： Zhaotong Basin is rich in lignite re- sources and in a simple geological conditions. Dur- ing the process of geological exploration,gas emits from many boreholes when the drill rods enter into coal seams,which indicates the abundant CB--M resources in the neogene system of Zhaotong basin. The canister desorption of coal imply that reservoir physical property is the key element of influencing gas desorption,which is also the underlying reason of low rank coal＇s high development potential de- spite low gas content.Started from the CBM reset- voir condition,the paper analyzes the gas sources, capability of coal reservoirs of the covers, construction and hydrodynamic, and makes a preliminary evaluation on the exploration prospect of the neogene CBM resources in Zhaotong Basin by analyzing the gas--bearing property and the biogas gen- eration potential of the coal seams.